Why is run-to-run total verification performed after the output phase?

Run-to-run total verification is a crucial process performed after the output phase to ensure that the data has been accurately processed and updated in the system. This verification method involves comparing the totals or summaries of data processed in one run with those in another run, confirming that all transactions have been processed as expected. It ensures that the results of the output align with the expected outcomes based on the input data and processing logic used.

By validating that the totals from one run match those from the previous run, auditors and data processors can be confident that no data was lost, duplicated, or altered inadvertently during processing. This step is essential in identifying any inconsistencies that might indicate processing errors, thereby confirming the integrity and accuracy of the results generated by the system.

This process plays a significant role in the overall data quality assurance framework, ensuring that business decisions based on this output are founded on reliable and accurate data.